(ZIFT) A form of assisted conception in which in vitro fertilisation (IVF) is used to produce fertilisation; transfer is made on the day after egg retrieval and IVF, before the fertilised egg divides (it's at the zygote, or pronuclear stage). Useful if the potential fertilising ability of sperm is in doubt. The transfer is made to the fallopian tube to obtain advantages similar to gamete intrafallopian transfer (GIFT) and is made possible by laparoscopy (with anesthesia) or by transvaginal ultrasound (without anesthesia). Synonymous with pronuclear-stage transfer (PROST).

A "minimally invasive" surgical operation at which instruments are passed through the wall of the abdomen: (1) for the diagnosis of abnormalities of the abdominal or pelvic organs (such as the fallopian tubes, ovaries and uterus) and to diagnose endometriosis; or (2) therapeutically, to reach the fallopian tubes for certain assisted conception procedures (see gamete intrafallopian transfer and zygote intrafallopian transfer). Carries the risks of surgery (damage to internal organs, hemorrhage, infection) and the risks of general anesthesia.

(PROST) A form of assisted conception in which in vitro fertilisation (IVF) is used to produce fertilisation of one or more recovered eggs (oocytes). Useful if the potential fertilising ability of sperm (spermatozoa) is in doubt. Transfer is made on the day after egg retrieval and IVF, before the fertilised egg divides (it's at the pronuclear stage); the transfer is made to the fallopian tube to obtain advantages similar to gamete intrafallopian transfer (GIFT) and is made possible by laparoscopy (with anesthesia) or, less successfully, by transvaginal ultrasound (without anesthesia). Synonymous with zygote intrafallopian transfer (ZIFT).

(TEST) A variation of zygote intrafallopian transfer (ZIFT) in which, usually a day after when ZIFT (or PROST) would be carried out, cleaving embryos (at a two-cell to four-cell stage) are transferred to the fallopian tube as part of an in vitro fertilisation program.